Stove-grate



2 Sheefis--Sheet 1. W. MOGLAVE. Stove-Grate.

No. 225,623.. Patented Mar. 16 1880.

)LFETBIS, PHOTO-LITHQGBAPMER. WASHINGTON. D C.

2 Sheets--Sheet 2;

W. MGGLAVE. Stove-Grams. No. 225,623. Patented Mar. 16, 1880.

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A; FIN-9 NITED STATES PATENT OFFICE.

WILLIAM MGQLAVE, OF PITTSTON, ASSIGNOR OF ONE-HALF OF HlS RIGHT TO JOHNA. PRICE, OF SCRANTON. PENNSYLVANIA.

STOVE-GRATE.

SPECIFICATION forming part of Letters Patent No. 225.623, dated March16, 1880.

Application filed October 16, 1879.

To all whom it may concern:

Be it known that 1, WILLIAM M cCLAvE, of Pittston, in the county ofLackawanna and State of Pennsylvania, have invented a certain new andImproved Stove-Grate; and I do hereby declare the following to be afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification, in whichFigure 1 is a top-plan view, showing the grate in position for use 5Fig. 2, a plan view of the middle plate; Fig. 3, a plan view of thelower plate, and Fig. 4 a cross-section in line as m, Fig. 1.

Similar letters of reference in the several figures denote the sameparts.

The object of this invention is to improve the construction andorganization of stovegrates, so as to secure to as great an extent aspossible the capacity to sift the ashes from the live coals withoutdanger of dumping the coals into the ash-pan, and without obstructingthe access of air to support combustion.

To this end my improved grate introduces a new principle-namely, thecombination of three grate surfaces or plates, in which the holes of theupper plate are arranged substantially over the bars or coal-supportin gsurfaces of thelowerplate, while the middle plate serves 0 as a cut-offto prevent the coals from falling through the holes of the upper plate,and also serves to scrape off and discharge into the ash pan such ashesor other substances as do pass through said holes or spaces and lodge onthe lower plates.

The grates may be of any size and shape, according to the character ofthe furnace, stove, or other structure wherein they are to be used.

In the above drawings 1 have shown a circular grate oscillating aroundits center, but the same three-plate principle may be applied tolongitudinally or laterally shaking or sliding grates, the essentialprinciple being that the lower plate shall present bars or coal-supportsunder the spaces of the upper plate,and that the middle plate shalloperate to clear the space between the two other plates.

In the drawings, A indicates the upper 50 plate, B the lower plate, andG the middle plate.

The upper plate is provided with a circular rim, a. from which lugs dextend down and serve to support the lower plate, the latter beingprovided with arms f,which are connected 5 to the lugs by pins E or anyother suitable fastening. "lhe rim a is beveled downward and outward onits outer upper edge. The upper plate is further'provided with a centralhub. A. which projects downward below the plane of the plate, forming ajournal or bearing which centers the middle plate, 0. The upper part ofthe hub is of greater diam eter than the lower part, and extends abovethe plane of the plate A in the form of a truncated cone. having lateralwings or flanges a. An orifice extends down vertically through thecenter of the hub, through which a portion of the air is supplied tosupport combustion. Radial supportirig-surfaces A extend from the hub tothe rim, and are provided with suitable openings (1?. Each of thesurfaces A has one of its upper corners or edges beveled or inclineddownward, as shown at a and the opposite lower edge or corner beveled orinclined in the same direction, as shown at a for purposes which will behereinafter explained. The supporting surfaces A are about equal inextent to the open spaces between them. and are of the same generalform. The flanges a extend from the inner end of saidsupporting-surfaces toward or to the top of the hub A.

The lower plate, B, is provided with a central hub, B. from whichsupporting-surfaees 13 extend outward to the periphery of the middleplate. U. and are each furnished with a lug, j, for purpose of support,as above described. Each of the surfaces B is suitably perforated. asshown at b. The surfaces B 0 are arranged directly under the spaceswhich exist between the supporting surfaces A of the upper plate, sothat any coals clinkers, or other materials than fine coal-ash, that mayfall through between the supporting-surtaces 5 of the upper plate willlodge upon the surfaces B of the lower plate.

The upper and lower plates are arranged at such a distance apart as toreceive and accommodate between them the middle plate, 0, I00 which isprovided with a hub, G, supportingsurfaces 0 and a rim, 0 from whichproject four (more or less) arms, 0'. The surfaces 0 are provided withsuitable perforations c.

All the openings or passages through the plates A B O, or any of them,are made smaller at the top than at the bottom, or, in other words,expand downward, so as to afford a more perfect clearance for the ashes,coals, and cinders; and at the outer extremity of the beveled edges tothe inner wall of the rim ais cut away or recessed, as shown at a forthe same purpose.

An arm or lug, a, extends from the rim a, to receive the poker or otheriron used in sh aking the grate.

The entire structure thus organized is supported upon the projectingarms 0 of the middle plate, which are dropped into-suitable recesses inthe wall of the stove or any part thereof which is designed to supportthe grate. The middle plate is thus held rigidlyin place,

while the upper and lower plates, connected firmly together by means ofthe lugs 0?, arms f, and pins 0, are capable of being vibrated laterallyupon the plate 0. The extent of this vibration is limited by suitablestops a or other means, so that the supporting-surfaces C can be broughtdirectly under the large open spaces of the plate A or under thesupporting-surfaces A of said plate.

The operation of the grate is as follows: In its normal condition thesurfaces G are directly under the spaces A thus furnishing a support forthe fuel throughout the entire extent of the grate, with suitableopenings for the upward passage of air to support combustion.

When it is desired to shake the grate the latter is turned as far as thestops will permit, thus opening the spaces A and allowing the ashes andcinders to fall through upon the surfaces 13 when, by reversing themovement of the grate, the lateral wall of the part 0 sweeps the ashesand cinders from the surfaces B and discharges them into the ash-panbeneath.

It will be observed that on their under side the surfaces 0 are providedat one edge with a downwardly-projecting flange, 0 extending down to thesurface B so as to efiectually sweep the latter. When the upper spaces,A are open this downwardly-projectin g flange 0 comes under the bevelededge a. This beveled or inclined edge serves to properly deflect theashes and cinders toward that side of the surfaces B from which they areto be discharged into the ash-pan, while the beveled lower corner, a,furnishes clearance for the cinders as they are thus discharged.

The arrangement of all these parts is such as to present at all times asupporting-surface to the mass of fuel above, but with abundant openingsat all times forthe upward passage of air.

By the vibration of the grate a series of pockets or cups arealternately opened at their upper end to receive the ashes and cindersfrom above, and are then opened at one side for the discharge of theircontents into the ashpan beneath, and the device which serves to sweeptheir contents out at the side thus opened by the act of sweeping closesand cuts off the entrance of cinders from above until the discharge ofthe pockets has been accomplished and they have been again opened. Theflanges a serve to strengthen the upper plate, and also operate asagitators to cause the proper separation of the ashes and cinders fromthe live coals during the shaking of the grate.

What I claim, and desire to secure by Letters Patent, is-

1. A horizontal flat grate consisting of the upper part, A, providedwith openings intermediate between the coal-supporting surfaces,

' the lower part, B, provided with openings beneath the coal-supportingsurfaces of the part A and supportingsurfaces beneath the openings ofthe part A, and an intermediate part, 0, provided with arms or scrapers,which operate to scrape the ashes from the supportingsufaces of thelower part, B, into the ash-pan below, substantially as described.

2. In a horizontal flat grate, the combination of the parts A B, rigidlyconnected to each other, and part 0, interposed between them, the partsAB and the part 0 being movable with relation to each other,substantially in the manner and for the purpose specified.

3. In a horizontal flat grate, the combination of a stationary centralor middle gratesection with upper and lower sections, vibrating upon acenter, and having the surfaces of the lower section under the openingsof the upper section, whereby the vibration of the upper and lowersections together alternately opens and closes a series of pockets,which receive the falling ashes and cinders, and discharges the ashesand cinders therefrom into the ash-box below, substantially asdescribed.

4. In combination with the horizontal fiat grate, the upper plate, A,having the central hub, A, extending above the plane of the plate andprovided with flanges at around its central opening, and, further,having perforated supporting-surfaces A extending from the hub to therim to, with beveled edges a a and with dumpin g openings or spaces Aalternating with the surfaces A substantially as described.

5. The combination of the three-part grate with raised center, centralopening, perforated middle and lower sections, double series of pockets,central guide, and attachments and connections, for the purposespecified.

WILLIAM MCCLAVE.

Witnesses M. OHURoH, L. HILL.

